9MM 124 +P vs 147 gr standard pressure
I like my Brownings, and my EAA Witness ca. 1993, too much, to use "plus p". However, in answering the question why to using a 'heavier' versus a 'lighter' bullet weight, yes, the trade-off is penetration comes first. When I use 'heavier' production loads, I use Win. 9mm 147 gr. FMJTC. (USA9MM1).
Hollow Points do not always work as designed, and become modified 'fmjs'.
Jihadists still shiver at the name, "Charles Martel". Where is he today?